android connect to internet event

Question

Is there an event that tells me that the device has connected to the INTERNET (3G or wifi)? I need to start some requests only after the device connects to the INTERNET. The code needs to support Android 2.1. Thanks

Answer 1

You can use a Broadcast receiver and wait for the action ConnectivityManager.CONNECTIVITY_ACTION

Here the doc

Ex:

broadcastReceiver = new BroadcastReceiver() {

                @Override
                public void onReceive(Context context, Intent intent) {

                    ConnectivityManager connectivity = (ConnectivityManager) context
                            .getSystemService(Context.CONNECTIVITY_SERVICE);


                        NetworkInfo[] info = connectivity.getAllNetworkInfo();
                        //Play with the info about current network state


                    }

                }
            };

            intentFilter = new IntentFilter();
            intentFilter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);
            registerReceiver(broadcastReceiver, intentFilter);

Answer 2

Use a Broadcast receiver which will get called whenever the network state changes:

private NetworkStateReceiver mNetSateReceiver = null;

private class NetworkStateReceiver extends BroadcastReceiver
{
    @Override
    public void onReceive( Context context, Intent intent )
    {
        // Check the network state to determine whether
        // we're connected or disconnected
    }
}

@Override
public void onCreate()
{
    registerReceiver( mNetSateReceiver, new IntentFilter(
        ConnectivityManager.CONNECTIVITY_ACTION ) );
}

@Override
public void onDestroy()
{
    save();
    unregisterReceiver( mNetSateReceiver );
}

onReceive will get called whenever the network state changes, and you can use the techniques detailed in the other answer to determine whether you're actually connected or not.